Only resolve a macro's instantiation loc once per macro, instead of once

per token lexed from it.  This speeds up clang on c99-intconst-1.c from
the GCC testsuite from 3.64s to 2.66s (36%).  This reduces the number of
binary search FileID lookups from 251570522 to 114175649 on this testcase.

llvm-svn: 62992

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/Lex/TokenLexer.cpp b/clang/lib/Lex/TokenLexer.cpp
index ea4ce669d1d..3707ef1ed6f 100644
--- a/clang/lib/Lex/TokenLexer.cpp
+++ b/clang/lib/Lex/TokenLexer.cpp
@@ -31,7 +31,14 @@ void TokenLexer::Init(Token &Tok, MacroArgs *Actuals) {
   Macro = PP.getMacroInfo(Tok.getIdentifierInfo());
   ActualArgs = Actuals;
   CurToken = 0;
+  
   InstantiateLoc = Tok.getLocation();
+
+  // If the instantiation loc is not already a FileID, resolve it here.  If we
+  // don't do this, we end up doing it once per token lexed.
+  if (!InstantiateLoc.isFileID())
+    InstantiateLoc = PP.getSourceManager().getInstantiationLoc(InstantiateLoc);
+  
   AtStartOfLine = Tok.isAtStartOfLine();
   HasLeadingSpace = Tok.hasLeadingSpace();
   Tokens = &*Macro->tokens_begin();