[clang] NFCI: Use FileEntryRef in suggestPathToFileForDiagnostics()

clang-tools-extra/clang-include-fixer/IncludeFixer.cpp

@@ -307,7 +307,8 @@ std::string IncludeFixerSemaSource::minimizeInclude(
 
   // Get the FileEntry for the include.
   StringRef StrippedInclude = Include.trim("\"<>");
-  auto Entry = SourceManager.getFileManager().getFile(StrippedInclude);
+  auto Entry =
+      SourceManager.getFileManager().getOptionalFileRef(StrippedInclude);
 
   // If the file doesn't exist return the path from the database.
   // FIXME: This should never happen.

clang/include/clang/Lex/HeaderSearch.h

@@ -870,7 +870,7 @@ class HeaderSearch {
   ///
   /// \param IsAngled If non-null, filled in to indicate whether the suggested
   ///        path should be referenced as <Header.h> instead of "Header.h".
-  std::string suggestPathToFileForDiagnostics(const FileEntry *File,
+  std::string suggestPathToFileForDiagnostics(FileEntryRef File,
                                               llvm::StringRef MainFile,
                                               bool *IsAngled = nullptr) const;
 

clang/include/clang/Lex/Preprocessor.h

@@ -2718,8 +2718,8 @@ class Preprocessor {
   /// \return A file that can be #included to provide the desired effect. Null
   ///         if no such file could be determined or if a #include is not
   ///         appropriate (eg, if a module should be imported instead).
-  const FileEntry *getHeaderToIncludeForDiagnostics(SourceLocation IncLoc,
-                                                    SourceLocation MLoc);
+  OptionalFileEntryRef getHeaderToIncludeForDiagnostics(SourceLocation IncLoc,
+                                                        SourceLocation MLoc);
 
   bool isRecordingPreamble() const {
     return PreambleConditionalStack.isRecording();

clang/lib/Lex/HeaderSearch.cpp

@@ -1923,11 +1923,8 @@ void HeaderSearch::loadSubdirectoryModuleMaps(DirectoryLookup &SearchDir) {
 }
 
 std::string HeaderSearch::suggestPathToFileForDiagnostics(
-    const FileEntry *File, llvm::StringRef MainFile, bool *IsAngled) const {
-  // FIXME: We assume that the path name currently cached in the FileEntry is
-  // the most appropriate one for this analysis (and that it's spelled the
-  // same way as the corresponding header search path).
-  return suggestPathToFileForDiagnostics(File->getName(), /*WorkingDir=*/"",
+    FileEntryRef File, llvm::StringRef MainFile, bool *IsAngled) const {
+  return suggestPathToFileForDiagnostics(File.getName(), /*WorkingDir=*/"",
                                          MainFile, IsAngled);
 }
 

clang/lib/Lex/PPDirectives.cpp

@@ -874,7 +874,7 @@ Module *Preprocessor::getModuleForLocation(SourceLocation Loc,
              : HeaderInfo.lookupModule(getLangOpts().CurrentModule, Loc);
 }
 
-const FileEntry *
+OptionalFileEntryRef
 Preprocessor::getHeaderToIncludeForDiagnostics(SourceLocation IncLoc,
                                                SourceLocation Loc) {
   Module *IncM = getModuleForLocation(
@@ -920,7 +920,7 @@ Preprocessor::getHeaderToIncludeForDiagnostics(SourceLocation IncLoc,
       // make a particular module visible. Let the caller know they should
       // suggest an import instead.
       if (getLangOpts().ObjC || getLangOpts().CPlusPlusModules)
-        return nullptr;
+        return std::nullopt;
 
       // If this is an accessible, non-textual header of M's top-level module
       // that transitively includes the given location and makes the
@@ -931,7 +931,7 @@ Preprocessor::getHeaderToIncludeForDiagnostics(SourceLocation IncLoc,
     // FIXME: If we're bailing out due to a private header, we shouldn't suggest
     // an import either.
     if (InPrivateHeader)
-      return nullptr;
+      return std::nullopt;
 
     // If the header is includable and has an include guard, assume the
     // intended way to expose its contents is by #include, not by importing a
@@ -942,7 +942,7 @@ Preprocessor::getHeaderToIncludeForDiagnostics(SourceLocation IncLoc,
     Loc = SM.getIncludeLoc(ID);
   }
 
-  return nullptr;
+  return std::nullopt;
 }
 
 OptionalFileEntryRef Preprocessor::LookupFile(

clang/lib/Sema/SemaLookup.cpp

@@ -5699,7 +5699,7 @@ void Sema::diagnoseMissingImport(SourceLocation Loc, const NamedDecl *Decl,
 
 /// Get a "quoted.h" or <angled.h> include path to use in a diagnostic
 /// suggesting the addition of a #include of the specified file.
-static std::string getHeaderNameForHeader(Preprocessor &PP, const FileEntry *E,
+static std::string getHeaderNameForHeader(Preprocessor &PP, FileEntryRef E,
                                           llvm::StringRef IncludingFile) {
   bool IsAngled = false;
   auto Path = PP.getHeaderSearchInfo().suggestPathToFileForDiagnostics(
@@ -5732,11 +5732,12 @@ void Sema::diagnoseMissingImport(SourceLocation UseLoc, const NamedDecl *Decl,
 
   // Try to find a suitable header-name to #include.
   std::string HeaderName;
-  if (const FileEntry *Header =
+  if (OptionalFileEntryRef Header =
           PP.getHeaderToIncludeForDiagnostics(UseLoc, DeclLoc)) {
     if (const FileEntry *FE =
             SourceMgr.getFileEntryForID(SourceMgr.getFileID(UseLoc)))
-      HeaderName = getHeaderNameForHeader(PP, Header, FE->tryGetRealPathName());
+      HeaderName =
+          getHeaderNameForHeader(PP, *Header, FE->tryGetRealPathName());
   }
 
   // If we have a #include we should suggest, or if all definition locations