From 05e5310ad86871a7a0492325428dfc6f73159f52 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 16 Apr 2008 04:11:35 +0000
Subject: [PATCH] switch AddLineNumber to use a SmallString instead of sstream.
  This speeds up -emit-html on ted's testcase by 29% (.138 -> 0.107s) in a
 release build.

llvm-svn: 49767
---
 clang/lib/Rewrite/HTMLRewrite.cpp | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/clang/lib/Rewrite/HTMLRewrite.cpp b/clang/lib/Rewrite/HTMLRewrite.cpp
index bc7864eebd38..fc1627af0294 100644
--- a/clang/lib/Rewrite/HTMLRewrite.cpp
+++ b/clang/lib/Rewrite/HTMLRewrite.cpp
@@ -15,6 +15,7 @@
 #include "clang/Rewrite/Rewriter.h"
 #include "clang/Rewrite/HTMLRewrite.h"
 #include "clang/Basic/SourceManager.h"
+#include "llvm/ADT/SmallString.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include <sstream>
 
@@ -113,17 +114,18 @@ std::string html::EscapeText(const std::string& s, bool EscapeSpaces,
 
 static void AddLineNumber(Rewriter& R, unsigned LineNo,
                           SourceLocation B, SourceLocation E) {
-    
-  std::ostringstream os;
-  os << "<tr><td class=\"num\" id=\"LN" << LineNo << "\">" 
-     << LineNo << "</td><td class=\"line\">";
-
+  llvm::SmallString<100> Str;
+  Str += "<tr><td class=\"num\" id=\"LN";
+  Str.append_uint(LineNo);
+  Str += "\">";
+  Str.append_uint(LineNo);
+  Str += "</td><td class=\"line\">";
+  
   if (B == E) { // Handle empty lines.
-    os << " </td></tr>";
-    R.InsertStrBefore(B, os.str());
-  }
-  else {
-    R.InsertStrBefore(B, os.str());
+    Str += " </td></tr>";
+    R.InsertTextBefore(B, &Str[0], Str.size());
+  } else {
+    R.InsertTextBefore(B, &Str[0], Str.size());
     R.InsertCStrBefore(E, "</td></tr>");
   }
 }