Add iteration over the preprocessor conditional stack to PreprocessorLexer

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@116703 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 0 deletions

diff --git a/include/clang/Lex/PreprocessorLexer.h b/include/clang/Lex/PreprocessorLexer.h
index 477a2130cf..d8332938a7 100644
--- a/include/clang/Lex/PreprocessorLexer.h
+++ b/include/clang/Lex/PreprocessorLexer.h
@@ -155,6 +155,18 @@ public:
   /// getFileEntry - Return the FileEntry corresponding to this FileID.  Like
   /// getFileID(), this only works for lexers with attached preprocessors.
   const FileEntry *getFileEntry() const;
+
+  /// \brief Iterator that traverses the current stack of preprocessor
+  /// conditional directives (#if/#ifdef/#ifndef).
+  typedef llvm::SmallVectorImpl<PPConditionalInfo>::const_iterator 
+    conditional_iterator;
+
+  conditional_iterator conditional_begin() const { 
+    return ConditionalStack.begin(); 
+  }
+  conditional_iterator conditional_end() const { 
+    return ConditionalStack.end(); 
+  }
 };
 
 }  // end namespace clang