Use a smallstring instead of an std::string in FileChanged to avoid some malloc traffic.

This speeds up -E on xalancbmk by 2.4%


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@40461 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 6 insertions, 1 deletions

diff --git a/include/clang/Basic/SourceManager.h b/include/clang/Basic/SourceManager.h
index dd8a86cc7e..825e7dee65 100644
--- a/include/clang/Basic/SourceManager.h
+++ b/include/clang/Basic/SourceManager.h
@@ -240,7 +240,7 @@ public:
   /// getSourceName - This method returns the name of the file or buffer that
   /// the SourceLocation specifies.  This can be modified with #line directives,
   /// etc.
-  std::string getSourceName(SourceLocation Loc);
+  const char *getSourceName(SourceLocation Loc);
 
   /// Given a SourceLocation object, return the logical location referenced by
   /// the ID.  This logical location is subject to #line directives, etc.
diff --git a/include/clang/Lex/Lexer.h b/include/clang/Lex/Lexer.h
index 6cff000207..18c2fca31a 100644
--- a/include/clang/Lex/Lexer.h
+++ b/include/clang/Lex/Lexer.h
@@ -17,6 +17,7 @@
 #include "clang/Lex/Token.h"
 #include "clang/Lex/MultipleIncludeOpt.h"
 #include "clang/Basic/LangOptions.h"
+#include "llvm/ADT/SmallVector.h"
 #include <string>
 #include <vector>
 #include <cassert>
@@ -173,6 +174,10 @@ public:
   /// If Charify is true, this escapes the ' character instead of ".
   static std::string Stringify(const std::string &Str, bool Charify = false);
   
+  /// Stringify - Convert the specified string into a C string by escaping '\'
+  /// and " characters.  This does not add surrounding ""'s to the string.
+  static void Stringify(llvm::SmallVectorImpl<char> &Str);
+  
   //===--------------------------------------------------------------------===//
   // Internal implementation interfaces.
 private: