PTHLexer::isNextPPTokenLParen() no longer calls GetToken() and just reads the token kind from the token data buffer. This results in a minor speedup and reduces the dependency on GetToken().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61168 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 2 deletions

diff --git a/include/clang/Lex/PTHLexer.h b/include/clang/Lex/PTHLexer.h
index 7654a39653..34e0b8a9fb 100644
--- a/include/clang/Lex/PTHLexer.h
+++ b/include/clang/Lex/PTHLexer.h
@@ -76,8 +76,13 @@ public:
   /// tok::l_paren token, 0 if it is something else and 2 if there are no more
   /// tokens controlled by this lexer.
   unsigned isNextPPTokenLParen() {
-    return AtLastToken() ? 2 : GetToken().is(tok::l_paren);
-  }
+    // isNextPPTokenLParen is not on the hot path, and all we care about is
+    // whether or not we are at a token with kind tok::eof or tok::l_paren.
+    // Just read the first byte from the current token pointer to determine
+    // its kind.
+    tok::TokenKind x = (tok::TokenKind) (uint8_t) *CurPtr;
+    return x == tok::eof ? 2 : x == tok::l_paren;
+  }    
 
   /// IndirectLex - An indirect call to 'Lex' that can be invoked via
   ///  the PreprocessorLexer interface.