[Lex] Allow to consume tokens while preprocessing

Summary:
By adding a hook to consume all tokens produced by the preprocessor.
The intention of this change is to make it possible to consume the
expanded tokens without re-runnig the preprocessor with minimal changes
to the preprocessor and minimal performance penalty when preprocessing
without recording the tokens.

The added hook is very low-level and reconstructing the expanded token
stream requires more work in the client code, the actual algorithm to
collect the tokens using this hook can be found in the follow-up change.

Reviewers: rsmith

Reviewed By: rsmith

Subscribers: eraman, nemanjai, kbarton, jsji, riccibruno, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D59885

llvm-svn: 361007

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Rewrite/HTMLRewrite.cpp b/clang/lib/Rewrite/HTMLRewrite.cpp
index 783c020f618..688dd7f7875 100644
--- a/clang/lib/Rewrite/HTMLRewrite.cpp
+++ b/clang/lib/Rewrite/HTMLRewrite.cpp
@@ -572,7 +572,7 @@ void html::HighlightMacros(Rewriter &R, FileID FID, const Preprocessor& PP) {
 
   // Enter the tokens we just lexed.  This will cause them to be macro expanded
   // but won't enter sub-files (because we removed #'s).
-  TmpPP.EnterTokenStream(TokenStream, false);
+  TmpPP.EnterTokenStream(TokenStream, false, /*IsReinject=*/false);
 
   TokenConcatenation ConcatInfo(TmpPP);