diff --git a/clang-tools-extra/clang-move/Move.cpp b/clang-tools-extra/clang-move/Move.cpp
index 1d10348430c28..ac16803b46783 100644
--- a/clang-tools-extra/clang-move/Move.cpp
+++ b/clang-tools-extra/clang-move/Move.cpp
@@ -133,7 +133,8 @@ class FindAllIncludes : public PPCallbacks {
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef /*File*/, StringRef SearchPath,
                           StringRef /*RelativePath*/,
-                          const Module * /*Imported*/,
+                          const Module * /*SuggestedModule*/,
+                          bool /*ModuleImported*/,
                           SrcMgr::CharacteristicKind /*FileType*/) override {
     if (auto FileEntry = SM.getFileEntryRefForID(SM.getFileID(HashLoc)))
       MoveTool->addIncludes(FileName, IsAngled, SearchPath,
diff --git a/clang-tools-extra/clang-tidy/ExpandModularHeadersPPCallbacks.cpp b/clang-tools-extra/clang-tidy/ExpandModularHeadersPPCallbacks.cpp
index 5ecd4fb19131e..5e2cc207560d3 100644
--- a/clang-tools-extra/clang-tidy/ExpandModularHeadersPPCallbacks.cpp
+++ b/clang-tools-extra/clang-tidy/ExpandModularHeadersPPCallbacks.cpp
@@ -166,12 +166,12 @@ void ExpandModularHeadersPPCallbacks::InclusionDirective(
     SourceLocation DirectiveLoc, const Token &IncludeToken,
     StringRef IncludedFilename, bool IsAngled, CharSourceRange FilenameRange,
     OptionalFileEntryRef IncludedFile, StringRef SearchPath,
-    StringRef RelativePath, const Module *Imported,
+    StringRef RelativePath, const Module *SuggestedModule, bool ModuleImported,
     SrcMgr::CharacteristicKind FileType) {
-  if (Imported) {
+  if (ModuleImported) {
     serialization::ModuleFile *MF =
         Compiler.getASTReader()->getModuleManager().lookup(
-            *Imported->getASTFile());
+            *SuggestedModule->getASTFile());
     handleModuleFile(MF);
   }
   parseToLocation(DirectiveLoc);
diff --git a/clang-tools-extra/clang-tidy/ExpandModularHeadersPPCallbacks.h b/clang-tools-extra/clang-tidy/ExpandModularHeadersPPCallbacks.h
index 3f6abc315e5b9..0742c21bc4372 100644
--- a/clang-tools-extra/clang-tidy/ExpandModularHeadersPPCallbacks.h
+++ b/clang-tools-extra/clang-tidy/ExpandModularHeadersPPCallbacks.h
@@ -69,7 +69,7 @@ class ExpandModularHeadersPPCallbacks : public PPCallbacks {
                           bool IsAngled, CharSourceRange FilenameRange,
                           OptionalFileEntryRef IncludedFile,
                           StringRef SearchPath, StringRef RelativePath,
-                          const Module *Imported,
+                          const Module *SuggestedModule, bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
 
   void EndOfMainFile() override;
diff --git a/clang-tools-extra/clang-tidy/altera/KernelNameRestrictionCheck.cpp b/clang-tools-extra/clang-tidy/altera/KernelNameRestrictionCheck.cpp
index 084e44a714d1f..fb1e0e82a3149 100644
--- a/clang-tools-extra/clang-tidy/altera/KernelNameRestrictionCheck.cpp
+++ b/clang-tools-extra/clang-tidy/altera/KernelNameRestrictionCheck.cpp
@@ -29,7 +29,8 @@ class KernelNameRestrictionPPCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FileNameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
 
   void EndOfMainFile() override;
@@ -61,7 +62,7 @@ void KernelNameRestrictionCheck::registerPPCallbacks(const SourceManager &SM,
 void KernelNameRestrictionPPCallbacks::InclusionDirective(
     SourceLocation HashLoc, const Token &, StringRef FileName, bool,
     CharSourceRange, OptionalFileEntryRef, StringRef, StringRef, const Module *,
-    SrcMgr::CharacteristicKind) {
+    bool, SrcMgr::CharacteristicKind) {
   IncludeDirective ID = {HashLoc, FileName};
   IncludeDirectives.push_back(std::move(ID));
 }
diff --git a/clang-tools-extra/clang-tidy/bugprone/SuspiciousIncludeCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/SuspiciousIncludeCheck.cpp
index 61d89cf308130..09ba79f055752 100644
--- a/clang-tools-extra/clang-tidy/bugprone/SuspiciousIncludeCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/SuspiciousIncludeCheck.cpp
@@ -26,7 +26,8 @@ class SuspiciousIncludePPCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
 
 private:
@@ -51,8 +52,8 @@ void SuspiciousIncludeCheck::registerPPCallbacks(
 void SuspiciousIncludePPCallbacks::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
   if (IncludeTok.getIdentifierInfo()->getPPKeywordID() == tok::pp_import)
     return;
 
diff --git a/clang-tools-extra/clang-tidy/llvm/IncludeOrderCheck.cpp b/clang-tools-extra/clang-tidy/llvm/IncludeOrderCheck.cpp
index bdd72f85e2a27..4246c8c574c50 100644
--- a/clang-tools-extra/clang-tidy/llvm/IncludeOrderCheck.cpp
+++ b/clang-tools-extra/clang-tidy/llvm/IncludeOrderCheck.cpp
@@ -27,7 +27,8 @@ class IncludeOrderPPCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
   void EndOfMainFile() override;
 
@@ -81,8 +82,8 @@ static int getPriority(StringRef Filename, bool IsAngled, bool IsMainModule) {
 void IncludeOrderPPCallbacks::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
   // We recognize the first include as a special main module header and want
   // to leave it in the top position.
   IncludeDirective ID = {HashLoc, FilenameRange, std::string(FileName),
diff --git a/clang-tools-extra/clang-tidy/llvmlibc/RestrictSystemLibcHeadersCheck.cpp b/clang-tools-extra/clang-tidy/llvmlibc/RestrictSystemLibcHeadersCheck.cpp
index 3451d3474fd90..b656917071a6c 100644
--- a/clang-tools-extra/clang-tidy/llvmlibc/RestrictSystemLibcHeadersCheck.cpp
+++ b/clang-tools-extra/clang-tidy/llvmlibc/RestrictSystemLibcHeadersCheck.cpp
@@ -33,7 +33,8 @@ class RestrictedIncludesPPCallbacks
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
 
 private:
@@ -45,14 +46,14 @@ class RestrictedIncludesPPCallbacks
 void RestrictedIncludesPPCallbacks::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
   // Compiler provided headers are allowed (e.g stddef.h).
   if (SrcMgr::isSystem(FileType) && SearchPath == CompilerIncudeDir)
     return;
   portability::RestrictedIncludesPPCallbacks::InclusionDirective(
       HashLoc, IncludeTok, FileName, IsAngled, FilenameRange, File, SearchPath,
-      RelativePath, Imported, FileType);
+      RelativePath, SuggestedModule, ModuleImported, FileType);
 }
 
 void RestrictSystemLibcHeadersCheck::registerPPCallbacks(
diff --git a/clang-tools-extra/clang-tidy/misc/HeaderIncludeCycleCheck.cpp b/clang-tools-extra/clang-tidy/misc/HeaderIncludeCycleCheck.cpp
index bebd6e390ed53..fadfdc869d37b 100644
--- a/clang-tools-extra/clang-tidy/misc/HeaderIncludeCycleCheck.cpp
+++ b/clang-tools-extra/clang-tidy/misc/HeaderIncludeCycleCheck.cpp
@@ -83,7 +83,7 @@ class CyclicDependencyCallbacks : public PPCallbacks {
   void InclusionDirective(SourceLocation, const Token &, StringRef FilePath,
                           bool, CharSourceRange Range,
                           OptionalFileEntryRef File, StringRef, StringRef,
-                          const Module *,
+                          const Module *, bool,
                           SrcMgr::CharacteristicKind FileType) override {
     if (FileType != clang::SrcMgr::C_User)
       return;
diff --git a/clang-tools-extra/clang-tidy/modernize/DeprecatedHeadersCheck.cpp b/clang-tools-extra/clang-tidy/modernize/DeprecatedHeadersCheck.cpp
index 030a781e2099b..6d287eb3642df 100644
--- a/clang-tools-extra/clang-tidy/modernize/DeprecatedHeadersCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/DeprecatedHeadersCheck.cpp
@@ -32,7 +32,8 @@ class IncludeModernizePPCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
 
 private:
@@ -178,8 +179,8 @@ IncludeModernizePPCallbacks::IncludeModernizePPCallbacks(
 void IncludeModernizePPCallbacks::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
 
   // If we don't want to warn for non-main file reports and this is one, skip
   // it.
diff --git a/clang-tools-extra/clang-tidy/modernize/MacroToEnumCheck.cpp b/clang-tools-extra/clang-tidy/modernize/MacroToEnumCheck.cpp
index b197c22dca410..0b47ed316ca27 100644
--- a/clang-tools-extra/clang-tidy/modernize/MacroToEnumCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/MacroToEnumCheck.cpp
@@ -117,7 +117,8 @@ class MacroToEnumCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override {
     clearCurrentEnum(HashLoc);
   }
diff --git a/clang-tools-extra/clang-tidy/portability/RestrictSystemIncludesCheck.cpp b/clang-tools-extra/clang-tidy/portability/RestrictSystemIncludesCheck.cpp
index 9ee0b4e6d3ccb..db5693e3b7cb7 100644
--- a/clang-tools-extra/clang-tidy/portability/RestrictSystemIncludesCheck.cpp
+++ b/clang-tools-extra/clang-tidy/portability/RestrictSystemIncludesCheck.cpp
@@ -21,8 +21,8 @@ namespace clang::tidy::portability {
 void RestrictedIncludesPPCallbacks::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
   if (!Check.contains(FileName) && SrcMgr::isSystem(FileType)) {
     SmallString<256> FullPath;
     llvm::sys::path::append(FullPath, SearchPath);
diff --git a/clang-tools-extra/clang-tidy/portability/RestrictSystemIncludesCheck.h b/clang-tools-extra/clang-tidy/portability/RestrictSystemIncludesCheck.h
index ad18e6f411dbb..60fae5e73a602 100644
--- a/clang-tools-extra/clang-tidy/portability/RestrictSystemIncludesCheck.h
+++ b/clang-tools-extra/clang-tidy/portability/RestrictSystemIncludesCheck.h
@@ -50,7 +50,8 @@ class RestrictedIncludesPPCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
   void EndOfMainFile() override;
 
diff --git a/clang-tools-extra/clang-tidy/readability/DuplicateIncludeCheck.cpp b/clang-tools-extra/clang-tidy/readability/DuplicateIncludeCheck.cpp
index d1f41e0ec79e2..67147164946ab 100644
--- a/clang-tools-extra/clang-tidy/readability/DuplicateIncludeCheck.cpp
+++ b/clang-tools-extra/clang-tidy/readability/DuplicateIncludeCheck.cpp
@@ -47,7 +47,8 @@ class DuplicateIncludeCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
 
   void MacroDefined(const Token &MacroNameTok,
@@ -76,8 +77,8 @@ void DuplicateIncludeCallbacks::FileChanged(SourceLocation Loc,
 void DuplicateIncludeCallbacks::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
   if (llvm::is_contained(Files.back(), FileName)) {
     // We want to delete the entire line, so make sure that [Start,End] covers
     // everything.
diff --git a/clang-tools-extra/clang-tidy/utils/IncludeInserter.cpp b/clang-tools-extra/clang-tidy/utils/IncludeInserter.cpp
index d0b7474992abd..b53016f331b79 100644
--- a/clang-tools-extra/clang-tidy/utils/IncludeInserter.cpp
+++ b/clang-tools-extra/clang-tidy/utils/IncludeInserter.cpp
@@ -25,7 +25,8 @@ class IncludeInserterCallback : public PPCallbacks {
                           bool IsAngled, CharSourceRange FileNameRange,
                           OptionalFileEntryRef /*IncludedFile*/,
                           StringRef /*SearchPath*/, StringRef /*RelativePath*/,
-                          const Module * /*ImportedModule*/,
+                          const Module * /*SuggestedModule*/,
+                          bool /*ModuleImported*/,
                           SrcMgr::CharacteristicKind /*FileType*/) override {
     Inserter->addInclude(FileNameRef, IsAngled, HashLocation,
                          IncludeToken.getEndLoc());
diff --git a/clang-tools-extra/clangd/Headers.cpp b/clang-tools-extra/clangd/Headers.cpp
index 076e636e0e281..75f8668e7bef0 100644
--- a/clang-tools-extra/clangd/Headers.cpp
+++ b/clang-tools-extra/clangd/Headers.cpp
@@ -41,7 +41,8 @@ class IncludeStructure::RecordHeaders : public PPCallbacks {
                           OptionalFileEntryRef File,
                           llvm::StringRef /*SearchPath*/,
                           llvm::StringRef /*RelativePath*/,
-                          const clang::Module * /*Imported*/,
+                          const clang::Module * /*SuggestedModule*/,
+                          bool /*ModuleImported*/,
                           SrcMgr::CharacteristicKind FileKind) override {
     auto MainFID = SM.getMainFileID();
     // If an include is part of the preamble patch, translate #line directives.
diff --git a/clang-tools-extra/clangd/ParsedAST.cpp b/clang-tools-extra/clangd/ParsedAST.cpp
index 14a91797f4d2e..bbb0e2c77b3f3 100644
--- a/clang-tools-extra/clangd/ParsedAST.cpp
+++ b/clang-tools-extra/clangd/ParsedAST.cpp
@@ -244,7 +244,7 @@ class ReplayPreamble : private PPCallbacks {
                             SynthesizedFilenameTok.getEndLoc())
               .toCharRange(SM),
           File, "SearchPath", "RelPath",
-          /*Imported=*/nullptr, Inc.FileKind);
+          /*SuggestedModule=*/nullptr, /*ModuleImported=*/false, Inc.FileKind);
       if (File)
         Delegate->FileSkipped(*File, SynthesizedFilenameTok, Inc.FileKind);
     }
diff --git a/clang-tools-extra/clangd/index/IndexAction.cpp b/clang-tools-extra/clangd/index/IndexAction.cpp
index 5d56285a83961..ed56c2a9d2e81 100644
--- a/clang-tools-extra/clangd/index/IndexAction.cpp
+++ b/clang-tools-extra/clangd/index/IndexAction.cpp
@@ -89,7 +89,8 @@ struct IncludeGraphCollector : public PPCallbacks {
                           llvm::StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, llvm::StringRef SearchPath,
-                          llvm::StringRef RelativePath, const Module *Imported,
+                          llvm::StringRef RelativePath,
+                          const Module *SuggestedModule, bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override {
     auto IncludeURI = toURI(File);
     if (!IncludeURI)
diff --git a/clang-tools-extra/clangd/unittests/ReplayPeambleTests.cpp b/clang-tools-extra/clangd/unittests/ReplayPeambleTests.cpp
index 472fe30ee46ed..147d9abe69137 100644
--- a/clang-tools-extra/clangd/unittests/ReplayPeambleTests.cpp
+++ b/clang-tools-extra/clangd/unittests/ReplayPeambleTests.cpp
@@ -72,7 +72,7 @@ struct ReplayPreamblePPCallback : public PPCallbacks {
   void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange, OptionalFileEntryRef,
-                          StringRef, StringRef, const clang::Module *,
+                          StringRef, StringRef, const clang::Module *, bool,
                           SrcMgr::CharacteristicKind) override {
     Includes.emplace_back(SM, HashLoc, IncludeTok, FileName, IsAngled,
                           FilenameRange);
diff --git a/clang-tools-extra/include-cleaner/lib/Record.cpp b/clang-tools-extra/include-cleaner/lib/Record.cpp
index c93c56adf650d..78a4df6cc40ea 100644
--- a/clang-tools-extra/include-cleaner/lib/Record.cpp
+++ b/clang-tools-extra/include-cleaner/lib/Record.cpp
@@ -65,7 +65,8 @@ class PPRecorder : public PPCallbacks {
                           StringRef SpelledFilename, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind) override {
     if (!Active)
       return;
@@ -214,7 +215,8 @@ class PragmaIncludes::RecordPragma : public PPCallbacks, public CommentHandler {
                           OptionalFileEntryRef File,
                           llvm::StringRef /*SearchPath*/,
                           llvm::StringRef /*RelativePath*/,
-                          const clang::Module * /*Imported*/,
+                          const clang::Module * /*SuggestedModule*/,
+                          bool /*ModuleImported*/,
                           SrcMgr::CharacteristicKind FileKind) override {
     FileID HashFID = SM.getFileID(HashLoc);
     int HashLine = SM.getLineNumber(HashFID, SM.getFileOffset(HashLoc));
diff --git a/clang-tools-extra/modularize/CoverageChecker.cpp b/clang-tools-extra/modularize/CoverageChecker.cpp
index 1e8b0aa37ca30..0e76c539aa3c8 100644
--- a/clang-tools-extra/modularize/CoverageChecker.cpp
+++ b/clang-tools-extra/modularize/CoverageChecker.cpp
@@ -90,7 +90,8 @@ class CoverageCheckerCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override {
     Checker.collectUmbrellaHeaderHeader(File->getName());
   }
diff --git a/clang-tools-extra/modularize/PreprocessorTracker.cpp b/clang-tools-extra/modularize/PreprocessorTracker.cpp
index 7557fb177ceb4..85e3aab041e49 100644
--- a/clang-tools-extra/modularize/PreprocessorTracker.cpp
+++ b/clang-tools-extra/modularize/PreprocessorTracker.cpp
@@ -730,15 +730,14 @@ class PreprocessorCallbacks : public clang::PPCallbacks {
   ~PreprocessorCallbacks() override {}
 
   // Overridden handlers.
-  void InclusionDirective(clang::SourceLocation HashLoc,
-                          const clang::Token &IncludeTok,
-                          llvm::StringRef FileName, bool IsAngled,
-                          clang::CharSourceRange FilenameRange,
-                          clang::OptionalFileEntryRef File,
-                          llvm::StringRef SearchPath,
-                          llvm::StringRef RelativePath,
-                          const clang::Module *Imported,
-                          clang::SrcMgr::CharacteristicKind FileType) override;
+  void
+  InclusionDirective(clang::SourceLocation HashLoc,
+                     const clang::Token &IncludeTok, llvm::StringRef FileName,
+                     bool IsAngled, clang::CharSourceRange FilenameRange,
+                     clang::OptionalFileEntryRef File,
+                     llvm::StringRef SearchPath, llvm::StringRef RelativePath,
+                     const clang::Module *SuggestedModule, bool ModuleImported,
+                     clang::SrcMgr::CharacteristicKind FileType) override;
   void FileChanged(clang::SourceLocation Loc,
                    clang::PPCallbacks::FileChangeReason Reason,
                    clang::SrcMgr::CharacteristicKind FileType,
@@ -1275,7 +1274,8 @@ void PreprocessorCallbacks::InclusionDirective(
     llvm::StringRef FileName, bool IsAngled,
     clang::CharSourceRange FilenameRange, clang::OptionalFileEntryRef File,
     llvm::StringRef SearchPath, llvm::StringRef RelativePath,
-    const clang::Module *Imported, clang::SrcMgr::CharacteristicKind FileType) {
+    const clang::Module *SuggestedModule, bool ModuleImported,
+    clang::SrcMgr::CharacteristicKind FileType) {
   int DirectiveLine, DirectiveColumn;
   std::string HeaderPath = getSourceLocationFile(PP, HashLoc);
   getSourceLocationLineAndColumn(PP, HashLoc, DirectiveLine, DirectiveColumn);
diff --git a/clang-tools-extra/pp-trace/PPCallbacksTracker.cpp b/clang-tools-extra/pp-trace/PPCallbacksTracker.cpp
index a59a8278682b2..3bb30fd15b2e1 100644
--- a/clang-tools-extra/pp-trace/PPCallbacksTracker.cpp
+++ b/clang-tools-extra/pp-trace/PPCallbacksTracker.cpp
@@ -135,7 +135,8 @@ void PPCallbacksTracker::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, llvm::StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
     llvm::StringRef SearchPath, llvm::StringRef RelativePath,
-    const Module *Imported, SrcMgr::CharacteristicKind FileType) {
+    const Module *SuggestedModule, bool ModuleImported,
+    SrcMgr::CharacteristicKind FileType) {
   beginCallback("InclusionDirective");
   appendArgument("HashLoc", HashLoc);
   appendArgument("IncludeTok", IncludeTok);
@@ -145,7 +146,8 @@ void PPCallbacksTracker::InclusionDirective(
   appendArgument("File", File);
   appendFilePathArgument("SearchPath", SearchPath);
   appendFilePathArgument("RelativePath", RelativePath);
-  appendArgument("Imported", Imported);
+  appendArgument("SuggestedModule", SuggestedModule);
+  appendArgument("ModuleImported", ModuleImported);
 }
 
 // Callback invoked whenever there was an explicit module-import
diff --git a/clang-tools-extra/pp-trace/PPCallbacksTracker.h b/clang-tools-extra/pp-trace/PPCallbacksTracker.h
index c195a72b08c1a..04590a919369a 100644
--- a/clang-tools-extra/pp-trace/PPCallbacksTracker.h
+++ b/clang-tools-extra/pp-trace/PPCallbacksTracker.h
@@ -95,7 +95,8 @@ class PPCallbacksTracker : public PPCallbacks {
                           llvm::StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, llvm::StringRef SearchPath,
-                          llvm::StringRef RelativePath, const Module *Imported,
+                          llvm::StringRef RelativePath,
+                          const Module *SuggestedModule, bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
   void moduleImport(SourceLocation ImportLoc, ModuleIdPath Path,
                     const Module *Imported) override;
diff --git a/clang-tools-extra/test/pp-trace/pp-trace-include.cpp b/clang-tools-extra/test/pp-trace/pp-trace-include.cpp
index db0b2c89430a2..ea9896e1cfde2 100644
--- a/clang-tools-extra/test/pp-trace/pp-trace-include.cpp
+++ b/clang-tools-extra/test/pp-trace/pp-trace-include.cpp
@@ -59,7 +59,8 @@
 // CHECK-NEXT:   File: "{{.*}}{{[/\\]}}Inputs/Level1A.h"
 // CHECK-NEXT:   SearchPath: "{{.*}}{{[/\\]}}pp-trace"
 // CHECK-NEXT:   RelativePath: "Inputs/Level1A.h"
-// CHECK-NEXT:   Imported: (null)
+// CHECK-NEXT:   SuggestedModule: (null)
+// CHECK-NEXT:   ModuleImported: false
 // CHECK-NEXT: - Callback: FileChanged
 // CHECK-NEXT:   Loc: "{{.*}}{{[/\\]}}Inputs/Level1A.h:1:1"
 // CHECK-NEXT:   Reason: EnterFile
@@ -74,7 +75,8 @@
 // CHECK-NEXT:   File: "{{.*}}{{[/\\]}}Inputs/Level2A.h"
 // CHECK-NEXT:   SearchPath: "{{.*}}{{[/\\]}}Inputs"
 // CHECK-NEXT:   RelativePath: "Level2A.h"
-// CHECK-NEXT:   Imported: (null)
+// CHECK-NEXT:   SuggestedModule: (null)
+// CHECK-NEXT:   ModuleImported: false
 // CHECK-NEXT: - Callback: FileChanged
 // CHECK-NEXT:   Loc: "{{.*}}{{[/\\]}}Inputs/Level2A.h:1:1"
 // CHECK-NEXT:   Reason: EnterFile
@@ -105,7 +107,8 @@
 // CHECK-NEXT:   File: "{{.*}}{{[/\\]}}Inputs/Level1B.h"
 // CHECK-NEXT:   SearchPath: "{{.*}}{{[/\\]}}pp-trace"
 // CHECK-NEXT:   RelativePath: "Inputs/Level1B.h"
-// CHECK-NEXT:   Imported: (null)
+// CHECK-NEXT:   SuggestedModule: (null)
+// CHECK-NEXT:   ModuleImported: false
 // CHECK-NEXT: - Callback: FileChanged
 // CHECK-NEXT:   Loc: "{{.*}}{{[/\\]}}Inputs/Level1B.h:1:1"
 // CHECK-NEXT:   Reason: EnterFile
@@ -120,7 +123,8 @@
 // CHECK-NEXT:   File: "{{.*}}{{[/\\]}}Inputs/Level2B.h"
 // CHECK-NEXT:   SearchPath: "{{.*}}{{[/\\]}}Inputs"
 // CHECK-NEXT:   RelativePath: "Level2B.h"
-// CHECK-NEXT:   Imported: (null)
+// CHECK-NEXT:   SuggestedModule: (null)
+// CHECK-NEXT:   ModuleImported: false
 // CHECK-NEXT: - Callback: FileChanged
 // CHECK-NEXT:   Loc: "{{.*}}{{[/\\]}}Inputs/Level2B.h:1:1"
 // CHECK-NEXT:   Reason: EnterFile
diff --git a/clang/include/clang/Lex/PPCallbacks.h b/clang/include/clang/Lex/PPCallbacks.h
index e3942af7be280..dfc74b52686f1 100644
--- a/clang/include/clang/Lex/PPCallbacks.h
+++ b/clang/include/clang/Lex/PPCallbacks.h
@@ -127,8 +127,10 @@ class PPCallbacks {
   /// \param RelativePath The path relative to SearchPath, at which the include
   /// file was found. This is equal to FileName except for framework includes.
   ///
-  /// \param Imported The module, whenever an inclusion directive was
-  /// automatically turned into a module import or null otherwise.
+  /// \param SuggestedModule The module suggested for this header, if any.
+  ///
+  /// \param ModuleImported Whether this include was translated into import of
+  /// \p SuggestedModule.
   ///
   /// \param FileType The characteristic kind, indicates whether a file or
   /// directory holds normal user code, system code, or system code which is
@@ -139,7 +141,8 @@ class PPCallbacks {
                                   bool IsAngled, CharSourceRange FilenameRange,
                                   OptionalFileEntryRef File,
                                   StringRef SearchPath, StringRef RelativePath,
-                                  const Module *Imported,
+                                  const Module *SuggestedModule,
+                                  bool ModuleImported,
                                   SrcMgr::CharacteristicKind FileType) {}
 
   /// Callback invoked whenever a submodule was entered.
@@ -473,14 +476,15 @@ class PPChainedCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override {
     First->InclusionDirective(HashLoc, IncludeTok, FileName, IsAngled,
                               FilenameRange, File, SearchPath, RelativePath,
-                              Imported, FileType);
+                              SuggestedModule, ModuleImported, FileType);
     Second->InclusionDirective(HashLoc, IncludeTok, FileName, IsAngled,
                                FilenameRange, File, SearchPath, RelativePath,
-                               Imported, FileType);
+                               SuggestedModule, ModuleImported, FileType);
   }
 
   void EnteredSubmodule(Module *M, SourceLocation ImportLoc,
diff --git a/clang/include/clang/Lex/PreprocessingRecord.h b/clang/include/clang/Lex/PreprocessingRecord.h
index 5ddf024186f86..437d8e4cc174e 100644
--- a/clang/include/clang/Lex/PreprocessingRecord.h
+++ b/clang/include/clang/Lex/PreprocessingRecord.h
@@ -532,7 +532,8 @@ class Token;
                             StringRef FileName, bool IsAngled,
                             CharSourceRange FilenameRange,
                             OptionalFileEntryRef File, StringRef SearchPath,
-                            StringRef RelativePath, const Module *Imported,
+                            StringRef RelativePath,
+                            const Module *SuggestedModule, bool ModuleImported,
                             SrcMgr::CharacteristicKind FileType) override;
     void Ifdef(SourceLocation Loc, const Token &MacroNameTok,
                const MacroDefinition &MD) override;
diff --git a/clang/include/clang/Tooling/DependencyScanning/ModuleDepCollector.h b/clang/include/clang/Tooling/DependencyScanning/ModuleDepCollector.h
index 051363b075de9..13ad253086492 100644
--- a/clang/include/clang/Tooling/DependencyScanning/ModuleDepCollector.h
+++ b/clang/include/clang/Tooling/DependencyScanning/ModuleDepCollector.h
@@ -166,7 +166,8 @@ class ModuleDepCollectorPP final : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
   void moduleImport(SourceLocation ImportLoc, ModuleIdPath Path,
                     const Module *Imported) override;
diff --git a/clang/lib/CodeGen/MacroPPCallbacks.cpp b/clang/lib/CodeGen/MacroPPCallbacks.cpp
index 8589869f6e2fb..c5d1e3ad5a205 100644
--- a/clang/lib/CodeGen/MacroPPCallbacks.cpp
+++ b/clang/lib/CodeGen/MacroPPCallbacks.cpp
@@ -168,8 +168,8 @@ void MacroPPCallbacks::FileChanged(SourceLocation Loc, FileChangeReason Reason,
 void MacroPPCallbacks::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
 
   // Record the line location of the current included file.
   LastHashLoc = HashLoc;
diff --git a/clang/lib/CodeGen/MacroPPCallbacks.h b/clang/lib/CodeGen/MacroPPCallbacks.h
index 5af177d0c3fa2..5f468648da044 100644
--- a/clang/lib/CodeGen/MacroPPCallbacks.h
+++ b/clang/lib/CodeGen/MacroPPCallbacks.h
@@ -102,7 +102,8 @@ class MacroPPCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
 
   /// Hook called whenever a macro definition is seen.
diff --git a/clang/lib/Frontend/DependencyFile.cpp b/clang/lib/Frontend/DependencyFile.cpp
index 19abcac2befbd..369816e89e1d6 100644
--- a/clang/lib/Frontend/DependencyFile.cpp
+++ b/clang/lib/Frontend/DependencyFile.cpp
@@ -66,7 +66,8 @@ struct DepCollectorPPCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override {
     if (!File)
       DepCollector.maybeAddDependency(FileName, /*FromModule*/ false,
diff --git a/clang/lib/Frontend/DependencyGraph.cpp b/clang/lib/Frontend/DependencyGraph.cpp
index b471471f3528a..20e5f233e224e 100644
--- a/clang/lib/Frontend/DependencyGraph.cpp
+++ b/clang/lib/Frontend/DependencyGraph.cpp
@@ -49,7 +49,8 @@ class DependencyGraphCallback : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
 
   void EndOfMainFile() override {
@@ -68,8 +69,8 @@ void clang::AttachDependencyGraphGen(Preprocessor &PP, StringRef OutputFile,
 void DependencyGraphCallback::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
   if (!File)
     return;
 
diff --git a/clang/lib/Frontend/ModuleDependencyCollector.cpp b/clang/lib/Frontend/ModuleDependencyCollector.cpp
index 939e611e54899..b88cb60ebdd2a 100644
--- a/clang/lib/Frontend/ModuleDependencyCollector.cpp
+++ b/clang/lib/Frontend/ModuleDependencyCollector.cpp
@@ -55,7 +55,8 @@ struct ModuleDependencyPPCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override {
     if (!File)
       return;
diff --git a/clang/lib/Frontend/PrecompiledPreamble.cpp b/clang/lib/Frontend/PrecompiledPreamble.cpp
index 62373b23b82ef..9b0ef30a14121 100644
--- a/clang/lib/Frontend/PrecompiledPreamble.cpp
+++ b/clang/lib/Frontend/PrecompiledPreamble.cpp
@@ -98,7 +98,8 @@ class MissingFileCollector : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override {
     // File is std::nullopt if it wasn't found.
     // (We have some false negatives if PP recovered e.g. <foo> -> "foo")
diff --git a/clang/lib/Frontend/PrintPreprocessedOutput.cpp b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
index 7f5f669068230..a26d2c3ab8582 100644
--- a/clang/lib/Frontend/PrintPreprocessedOutput.cpp
+++ b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
@@ -153,7 +153,8 @@ class PrintPPOutputPPCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
   void Ident(SourceLocation Loc, StringRef str) override;
   void PragmaMessage(SourceLocation Loc, StringRef Namespace,
@@ -401,8 +402,8 @@ void PrintPPOutputPPCallbacks::FileChanged(SourceLocation Loc,
 void PrintPPOutputPPCallbacks::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
   // In -dI mode, dump #include directives prior to dumping their content or
   // interpretation. Similar for -fkeep-system-includes.
   if (DumpIncludeDirectives || (KeepSystemIncludes && isSystem(FileType))) {
@@ -418,14 +419,14 @@ void PrintPPOutputPPCallbacks::InclusionDirective(
   }
 
   // When preprocessing, turn implicit imports into module import pragmas.
-  if (Imported) {
+  if (ModuleImported) {
     switch (IncludeTok.getIdentifierInfo()->getPPKeywordID()) {
     case tok::pp_include:
     case tok::pp_import:
     case tok::pp_include_next:
       MoveToLine(HashLoc, /*RequireStartOfLine=*/true);
       *OS << "#pragma clang module import "
-          << Imported->getFullModuleName(true)
+          << SuggestedModule->getFullModuleName(true)
           << " /* clang -E: implicit import for "
           << "#" << PP.getSpelling(IncludeTok) << " "
           << (IsAngled ? '<' : '"') << FileName << (IsAngled ? '>' : '"')
diff --git a/clang/lib/Frontend/Rewrite/InclusionRewriter.cpp b/clang/lib/Frontend/Rewrite/InclusionRewriter.cpp
index b6b37461089e4..1462058003b3d 100644
--- a/clang/lib/Frontend/Rewrite/InclusionRewriter.cpp
+++ b/clang/lib/Frontend/Rewrite/InclusionRewriter.cpp
@@ -75,7 +75,8 @@ class InclusionRewriter : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override;
   void If(SourceLocation Loc, SourceRange ConditionRange,
           ConditionValueKind ConditionValue) override;
@@ -189,9 +190,10 @@ void InclusionRewriter::InclusionDirective(
     StringRef /*FileName*/, bool /*IsAngled*/,
     CharSourceRange /*FilenameRange*/, OptionalFileEntryRef /*File*/,
     StringRef /*SearchPath*/, StringRef /*RelativePath*/,
-    const Module *Imported, SrcMgr::CharacteristicKind FileType) {
-  if (Imported) {
-    auto P = ModuleIncludes.insert(std::make_pair(HashLoc, Imported));
+    const Module *SuggestedModule, bool ModuleImported,
+    SrcMgr::CharacteristicKind FileType) {
+  if (ModuleImported) {
+    auto P = ModuleIncludes.insert(std::make_pair(HashLoc, SuggestedModule));
     (void)P;
     assert(P.second && "Unexpected revisitation of the same include directive");
   } else
diff --git a/clang/lib/Lex/PPDirectives.cpp b/clang/lib/Lex/PPDirectives.cpp
index a980f4bcbae12..97f9c0ada91de 100644
--- a/clang/lib/Lex/PPDirectives.cpp
+++ b/clang/lib/Lex/PPDirectives.cpp
@@ -2253,26 +2253,27 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
 
   // FIXME: We do not have a good way to disambiguate C++ clang modules from
   // C++ standard modules (other than use/non-use of Header Units).
-  Module *SM = SuggestedModule.getModule();
 
-  bool MaybeTranslateInclude =
-      Action == Enter && File && SM && !SM->isForBuilding(getLangOpts());
+  Module *ModuleToImport = SuggestedModule.getModule();
+
+  bool MaybeTranslateInclude = Action == Enter && File && ModuleToImport &&
+                               !ModuleToImport->isForBuilding(getLangOpts());
 
   // Maybe a usable Header Unit
   bool UsableHeaderUnit = false;
-  if (getLangOpts().CPlusPlusModules && SM && SM->isHeaderUnit()) {
+  if (getLangOpts().CPlusPlusModules && ModuleToImport &&
+      ModuleToImport->isHeaderUnit()) {
     if (TrackGMFState.inGMF() || IsImportDecl)
       UsableHeaderUnit = true;
     else if (!IsImportDecl) {
       // This is a Header Unit that we do not include-translate
-      SuggestedModule = ModuleMap::KnownHeader();
-      SM = nullptr;
+      ModuleToImport = nullptr;
     }
   }
   // Maybe a usable clang header module.
   bool UsableClangHeaderModule =
-      (getLangOpts().CPlusPlusModules || getLangOpts().Modules) && SM &&
-      !SM->isHeaderUnit();
+      (getLangOpts().CPlusPlusModules || getLangOpts().Modules) &&
+      ModuleToImport && !ModuleToImport->isHeaderUnit();
 
   // Determine whether we should try to import the module for this #include, if
   // there is one. Don't do so if precompiled module support is disabled or we
@@ -2282,12 +2283,11 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
     // unavailable, diagnose the situation and bail out.
     // FIXME: Remove this; loadModule does the same check (but produces
     // slightly worse diagnostics).
-    if (checkModuleIsAvailable(getLangOpts(), getTargetInfo(),
-                               *SuggestedModule.getModule(),
+    if (checkModuleIsAvailable(getLangOpts(), getTargetInfo(), *ModuleToImport,
                                getDiagnostics())) {
       Diag(FilenameTok.getLocation(),
            diag::note_implicit_top_level_module_import_here)
-          << SuggestedModule.getModule()->getTopLevelModuleName();
+          << ModuleToImport->getTopLevelModuleName();
       return {ImportAction::None};
     }
 
@@ -2295,7 +2295,7 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
     // FIXME: Should we have a second loadModule() overload to avoid this
     // extra lookup step?
     SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
-    for (Module *Mod = SM; Mod; Mod = Mod->Parent)
+    for (Module *Mod = ModuleToImport; Mod; Mod = Mod->Parent)
       Path.push_back(std::make_pair(getIdentifierInfo(Mod->Name),
                                     FilenameTok.getLocation()));
     std::reverse(Path.begin(), Path.end());
@@ -2306,12 +2306,12 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
 
     // Load the module to import its macros. We'll make the declarations
     // visible when the parser gets here.
-    // FIXME: Pass SuggestedModule in here rather than converting it to a path
-    // and making the module loader convert it back again.
+    // FIXME: Pass SM in here rather than converting it to a path and making the
+    // module loader convert it back again.
     ModuleLoadResult Imported = TheModuleLoader.loadModule(
         IncludeTok.getLocation(), Path, Module::Hidden,
         /*IsInclusionDirective=*/true);
-    assert((Imported == nullptr || Imported == SuggestedModule.getModule()) &&
+    assert((Imported == nullptr || Imported == SM) &&
            "the imported module is different than the suggested one");
 
     if (Imported) {
@@ -2323,8 +2323,7 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
       // was in the directory of an umbrella header, for instance), but no
       // actual module containing it exists (because the umbrella header is
       // incomplete).  Treat this as a textual inclusion.
-      SuggestedModule = ModuleMap::KnownHeader();
-      SM = nullptr;
+      ModuleToImport = nullptr;
     } else if (Imported.isConfigMismatch()) {
       // On a configuration mismatch, enter the header textually. We still know
       // that it's part of the corresponding module.
@@ -2365,7 +2364,7 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
   // this file will have no effect.
   if (Action == Enter && File &&
       !HeaderInfo.ShouldEnterIncludeFile(*this, *File, EnterOnce,
-                                         getLangOpts().Modules, SM,
+                                         getLangOpts().Modules, ModuleToImport,
                                          IsFirstIncludeOfFile)) {
     // C++ standard modules:
     // If we are not in the GMF, then we textually include only
@@ -2380,7 +2379,7 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
     if (UsableHeaderUnit && !getLangOpts().CompilingPCH)
       Action = TrackGMFState.inGMF() ? Import : Skip;
     else
-      Action = (SuggestedModule && !getLangOpts().CompilingPCH) ? Import : Skip;
+      Action = (ModuleToImport && !getLangOpts().CompilingPCH) ? Import : Skip;
   }
 
   // Check for circular inclusion of the main file.
@@ -2400,8 +2399,7 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
     // FIXME: Use a different callback for a pp-import?
     Callbacks->InclusionDirective(HashLoc, IncludeTok, LookupFilename, isAngled,
                                   FilenameRange, File, SearchPath, RelativePath,
-                                  Action == Import ? SuggestedModule.getModule()
-                                                   : nullptr,
+                                  SuggestedModule.getModule(), Action == Import,
                                   FileCharacter);
     if (Action == Skip && File)
       Callbacks->FileSkipped(*File, FilenameTok, FileCharacter);
@@ -2412,7 +2410,7 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
 
   // If this is a C++20 pp-import declaration, diagnose if we didn't find any
   // module corresponding to the named header.
-  if (IsImportDecl && !SuggestedModule) {
+  if (IsImportDecl && !ModuleToImport) {
     Diag(FilenameTok, diag::err_header_import_not_header_unit)
       << OriginalFilename << File->getName();
     return {ImportAction::None};
@@ -2517,8 +2515,8 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
   switch (Action) {
   case Skip:
     // If we don't need to enter the file, stop now.
-    if (SM)
-      return {ImportAction::SkippedModuleImport, SM};
+    if (ModuleToImport)
+      return {ImportAction::SkippedModuleImport, ModuleToImport};
     return {ImportAction::None};
 
   case IncludeLimitReached:
@@ -2530,13 +2528,13 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
     // If this is a module import, make it visible if needed.
     assert(SM && "no module to import");
 
-    makeModuleVisible(SM, EndLoc);
+    makeModuleVisible(ModuleToImport, EndLoc);
 
     if (IncludeTok.getIdentifierInfo()->getPPKeywordID() ==
         tok::pp___include_macros)
       return {ImportAction::None};
 
-    return {ImportAction::ModuleImport, SM};
+    return {ImportAction::ModuleImport, ModuleToImport};
   }
 
   case Enter:
@@ -2573,13 +2571,14 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
 
   // Determine if we're switching to building a new submodule, and which one.
   // This does not apply for C++20 modules header units.
-  if (SM && !SM->isHeaderUnit()) {
-    if (SM->getTopLevelModule()->ShadowingModule) {
+  if (ModuleToImport && !ModuleToImport->isHeaderUnit()) {
+    if (ModuleToImport->getTopLevelModule()->ShadowingModule) {
       // We are building a submodule that belongs to a shadowed module. This
       // means we find header files in the shadowed module.
-      Diag(SM->DefinitionLoc, diag::err_module_build_shadowed_submodule)
-          << SM->getFullModuleName();
-      Diag(SM->getTopLevelModule()->ShadowingModule->DefinitionLoc,
+      Diag(ModuleToImport->DefinitionLoc,
+           diag::err_module_build_shadowed_submodule)
+          << ModuleToImport->getFullModuleName();
+      Diag(ModuleToImport->getTopLevelModule()->ShadowingModule->DefinitionLoc,
            diag::note_previous_definition);
       return {ImportAction::None};
     }
@@ -2591,21 +2590,22 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
     // that behaves the same as the header would behave in a compilation using
     // that PCH, which means we should enter the submodule. We need to teach
     // the AST serialization layer to deal with the resulting AST.
-    if (getLangOpts().CompilingPCH && SM->isForBuilding(getLangOpts()))
+    if (getLangOpts().CompilingPCH &&
+        ModuleToImport->isForBuilding(getLangOpts()))
       return {ImportAction::None};
 
     assert(!CurLexerSubmodule && "should not have marked this as a module yet");
-    CurLexerSubmodule = SM;
+    CurLexerSubmodule = ModuleToImport;
 
     // Let the macro handling code know that any future macros are within
     // the new submodule.
-    EnterSubmodule(SM, EndLoc, /*ForPragma*/ false);
+    EnterSubmodule(ModuleToImport, EndLoc, /*ForPragma*/ false);
 
     // Let the parser know that any future declarations are within the new
     // submodule.
     // FIXME: There's no point doing this if we're handling a #__include_macros
     // directive.
-    return {ImportAction::ModuleBegin, SM};
+    return {ImportAction::ModuleBegin, ModuleToImport};
   }
 
   assert(!IsImportDecl && "failed to diagnose missing module for import decl");
diff --git a/clang/lib/Lex/PreprocessingRecord.cpp b/clang/lib/Lex/PreprocessingRecord.cpp
index aab6a2bed89d9..be5aac7ef31b8 100644
--- a/clang/lib/Lex/PreprocessingRecord.cpp
+++ b/clang/lib/Lex/PreprocessingRecord.cpp
@@ -472,8 +472,8 @@ void PreprocessingRecord::MacroUndefined(const Token &Id,
 void PreprocessingRecord::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
   InclusionDirective::InclusionKind Kind = InclusionDirective::Include;
 
   switch (IncludeTok.getIdentifierInfo()->getPPKeywordID()) {
@@ -506,10 +506,9 @@ void PreprocessingRecord::InclusionDirective(
       EndLoc = EndLoc.getLocWithOffset(-1); // the InclusionDirective expects
                                             // a token range.
   }
-  clang::InclusionDirective *ID =
-      new (*this) clang::InclusionDirective(*this, Kind, FileName, !IsAngled,
-                                            (bool)Imported, File,
-                                            SourceRange(HashLoc, EndLoc));
+  clang::InclusionDirective *ID = new (*this) clang::InclusionDirective(
+      *this, Kind, FileName, !IsAngled, ModuleImported, File,
+      SourceRange(HashLoc, EndLoc));
   addPreprocessedEntity(ID);
 }
 
diff --git a/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp b/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
index 995d8b2899c8d..5a9e563c2d5b2 100644
--- a/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
+++ b/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
@@ -430,14 +430,14 @@ void ModuleDepCollectorPP::LexedFileChanged(FileID FID,
 void ModuleDepCollectorPP::InclusionDirective(
     SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
     bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
-    StringRef SearchPath, StringRef RelativePath, const Module *Imported,
-    SrcMgr::CharacteristicKind FileType) {
-  if (!File && !Imported) {
+    StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
+    bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
+  if (!File && !ModuleImported) {
     // This is a non-modular include that HeaderSearch failed to find. Add it
     // here as `FileChanged` will never see it.
     MDC.addFileDep(FileName);
   }
-  handleImport(Imported);
+  handleImport(SuggestedModule);
 }
 
 void ModuleDepCollectorPP::moduleImport(SourceLocation ImportLoc,
diff --git a/clang/tools/libclang/Indexing.cpp b/clang/tools/libclang/Indexing.cpp
index 17d393ef80842..05d88452209fb 100644
--- a/clang/tools/libclang/Indexing.cpp
+++ b/clang/tools/libclang/Indexing.cpp
@@ -261,12 +261,13 @@ class IndexPPCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override {
     bool isImport = (IncludeTok.is(tok::identifier) &&
             IncludeTok.getIdentifierInfo()->getPPKeywordID() == tok::pp_import);
     DataConsumer.ppIncludedFile(HashLoc, FileName, File, isImport, IsAngled,
-                            Imported);
+                                ModuleImported);
   }
 
   /// MacroDefined - This hook is called whenever a macro definition is seen.
diff --git a/clang/unittests/Lex/PPCallbacksTest.cpp b/clang/unittests/Lex/PPCallbacksTest.cpp
index e0a27b5111821..f3cdb1dfb2874 100644
--- a/clang/unittests/Lex/PPCallbacksTest.cpp
+++ b/clang/unittests/Lex/PPCallbacksTest.cpp
@@ -37,7 +37,8 @@ class InclusionDirectiveCallbacks : public PPCallbacks {
                           StringRef FileName, bool IsAngled,
                           CharSourceRange FilenameRange,
                           OptionalFileEntryRef File, StringRef SearchPath,
-                          StringRef RelativePath, const Module *Imported,
+                          StringRef RelativePath, const Module *SuggestedModule,
+                          bool ModuleImported,
                           SrcMgr::CharacteristicKind FileType) override {
     this->HashLoc = HashLoc;
     this->IncludeTok = IncludeTok;
@@ -47,7 +48,8 @@ class InclusionDirectiveCallbacks : public PPCallbacks {
     this->File = File;
     this->SearchPath = SearchPath.str();
     this->RelativePath = RelativePath.str();
-    this->Imported = Imported;
+    this->SuggestedModule = SuggestedModule;
+    this->ModuleImported = ModuleImported;
     this->FileType = FileType;
   }
 
@@ -59,7 +61,8 @@ class InclusionDirectiveCallbacks : public PPCallbacks {
   OptionalFileEntryRef File;
   SmallString<16> SearchPath;
   SmallString<16> RelativePath;
-  const Module* Imported;
+  const Module *SuggestedModule;
+  bool ModuleImported;
   SrcMgr::CharacteristicKind FileType;
 };