Introduce SourceManager::getDecomposedIncludedLoc, that returns the "included/expanded in" decomposed location of the given FileID.

The main benefit is to speed-up SourceManager::isBeforeInTranslationUnit which is common to query
the included/expanded location of the same FileID multiple times.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179435 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 0 deletions

diff --git a/include/clang/Basic/SourceManager.h b/include/clang/Basic/SourceManager.h
index 00c96c3da0..f82b196929 100644
--- a/include/clang/Basic/SourceManager.h
+++ b/include/clang/Basic/SourceManager.h
@@ -646,6 +646,13 @@ class SourceManager : public RefCountedBase<SourceManager> {
   // Statistics for -print-stats.
   mutable unsigned NumLinearScans, NumBinaryProbes;
 
+  /// \brief Associates a FileID with its "included/expanded in" decomposed
+  /// location.
+  ///
+  /// Used to cache results from and speed-up \c getDecomposedIncludedLoc
+  /// function.
+  mutable llvm::DenseMap<FileID, std::pair<FileID, unsigned> > IncludedLocMap;
+
   /// The key value into the IsBeforeInTUCache table.
   typedef std::pair<FileID, FileID> IsBeforeInTUCacheKey;
 
@@ -1127,6 +1134,10 @@ public:
     return getDecomposedSpellingLocSlowCase(E, Offset);
   }
 
+  /// \brief Returns the "included/expanded in" decomposed location of the given
+  /// FileID.
+  std::pair<FileID, unsigned> getDecomposedIncludedLoc(FileID FID) const;
+
   /// \brief Returns the offset from the start of the file that the
   /// specified SourceLocation represents.
   ///