From: Eli Friedman <eli.friedman@gmail.com>
Date: Tue, 10 May 2011 17:11:21 +0000 (+0000)
Subject: Don't strlen() every file before parsing it.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=969f9d47338fc36ebb6d24ad3a51e45eda07fd58;p=clang

Don't strlen() every file before parsing it.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@131132 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Lex/Lexer.cpp b/lib/Lex/Lexer.cpp
index 16cc4f8fd5..3b1149c08a 100644
--- a/lib/Lex/Lexer.cpp
+++ b/lib/Lex/Lexer.cpp
@@ -76,7 +76,8 @@ void Lexer::InitLexer(const char *BufStart, const char *BufPtr,
   // skip the UTF-8 BOM if it's present.
   if (BufferStart == BufferPtr) {
     // Determine the size of the BOM.
-    size_t BOMLength = llvm::StringSwitch<size_t>(BufferStart)
+    llvm::StringRef Buf(BufferStart, BufferEnd - BufferStart);
+    size_t BOMLength = llvm::StringSwitch<size_t>(Buf)
       .StartsWith("\xEF\xBB\xBF", 3) // UTF-8 BOM
       .Default(0);