[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
diff --git a/clang/lib/Frontend/PrintPreprocessedOutput.cpp b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
index 584f94d..720ed51 100644
--- a/clang/lib/Frontend/PrintPreprocessedOutput.cpp
+++ b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
@@ -678,7 +678,8 @@
auto Toks = llvm::make_unique<Token[]>(1);
Toks[0] = PragmaTok;
PP.EnterTokenStream(std::move(Toks), /*NumToks=*/1,
- /*DisableMacroExpansion=*/false);
+ /*DisableMacroExpansion=*/false,
+ /*IsReinject=*/false);
PP.Lex(PragmaTok);
}
Token PrevToken;