[Lexer] Improve Lexer::getSourceText() when the given range deals with function macro arguments.

This is a modified version of a patch by Manuel Klimek.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182055 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 24 insertions, 0 deletions

diff --git a/include/clang/Basic/SourceManager.h b/include/clang/Basic/SourceManager.h
index eccbf1ede7..5fd5a47a4a 100644
--- a/include/clang/Basic/SourceManager.h
+++ b/include/clang/Basic/SourceManager.h
@@ -1161,6 +1161,22 @@ public:
   /// expansion but not the expansion of an argument to a function-like macro.
   bool isMacroBodyExpansion(SourceLocation Loc) const;
 
+  /// \brief Returns true if the given MacroID location points at the beginning
+  /// of the immediate macro expansion.
+  ///
+  /// \param MacroBegin If non-null and function returns true, it is set to the
+  /// begin location of the immediate macro expansion.
+  bool isAtStartOfImmediateMacroExpansion(SourceLocation Loc,
+                                          SourceLocation *MacroBegin = 0) const;
+
+  /// \brief Returns true if the given MacroID location points at the character
+  /// end of the immediate macro expansion.
+  ///
+  /// \param MacroEnd If non-null and function returns true, it is set to the
+  /// character end location of the immediate macro expansion.
+  bool isAtEndOfImmediateMacroExpansion(SourceLocation Loc,
+                                        SourceLocation *MacroEnd = 0) const;
+
   /// \brief Returns true if \p Loc is inside the [\p Start, +\p Length)
   /// chunk of the source location address space.
   ///
@@ -1570,6 +1586,14 @@ private:
     return SLocOffset < getSLocEntryByID(FID.ID+1).getOffset();
   }
 
+  /// \brief Returns the previous in-order FileID or an invalid FileID if there
+  /// is no previous one.
+  FileID getPreviousFileID(FileID FID) const;
+
+  /// \brief Returns the next in-order FileID or an invalid FileID if there is
+  /// no next one.
+  FileID getNextFileID(FileID FID) const;
+
   /// \brief Create a new fileID for the specified ContentCache and
   /// include position.
   ///