[clang][lex] Refactor check for the first file include

This patch refactors the code that checks whether a file has just been included for the first time.

The `HeaderSearch::FirstTimeLexingFile` function is removed and the information is threaded to the original call site from `HeaderSearch::ShouldEnterIncludeFile`. This will make it possible to avoid tracking the number of includes in a follow up patch.

Depends on D114092.

Reviewed By: dexonsmith

Differential Revision: https://reviews.llvm.org/D114093

1 files changed, 6 insertions, 1 deletions

diff --git a/clang/lib/Lex/HeaderSearch.cpp b/clang/lib/Lex/HeaderSearch.cpp
index 150e7ed..a0b6011 100644
--- a/clang/lib/Lex/HeaderSearch.cpp
+++ b/clang/lib/Lex/HeaderSearch.cpp
@@ -1310,9 +1310,12 @@ void HeaderSearch::MarkFileModuleHeader(const FileEntry *FE,
 
 bool HeaderSearch::ShouldEnterIncludeFile(Preprocessor &PP,
                                           const FileEntry *File, bool isImport,
-                                          bool ModulesEnabled, Module *M) {
+                                          bool ModulesEnabled, Module *M,
+                                          bool &IsFirstIncludeOfFile) {
   ++NumIncluded; // Count # of attempted #includes.
 
+  IsFirstIncludeOfFile = false;
+
   // Get information about this file.
   HeaderFileInfo &FileInfo = getFileInfo(File);
 
@@ -1387,6 +1390,8 @@ bool HeaderSearch::ShouldEnterIncludeFile(Preprocessor &PP,
   // Increment the number of times this file has been included.
   ++FileInfo.NumIncludes;
 
+  IsFirstIncludeOfFile = FileInfo.NumIncludes == 1;
+
   return true;
 }